Jig for mounting split patterns



Dec. 18, 1934. TURNER 1,984,387

JIG FOR MOUNTING SPLIT PATTERNS Filed Sept. 8, 1932 2 Sheets-Sheet l INVENTOR 61.55/27- 771mm? MA 6. ATTORNEY Dec. 18, 1934. A. TURNER 1,984,387

JIG FOR MOUNTING SPLIT PATTERNS Filed Se pt. 8, 1932 2 Sheets-Sheet 2 INVENTOR BY met-er 72/202 @{M ATTORNEY Patented Dec. 18, 1934 I a; I l

U NIT ED? SJ PAT E NT F F 1 CIE. I

. .JI'G.FOR. M 0UNTING SPLIT-PATTERNS 1 V U AlbertTlirner, Siles,la'. Application -september s, 1932; S erial No. 632,265 7 8 Claims; 7 (cm-191) (Graxitedunder the act oflMarch 3, 1883', as

amendedQApril530;1928; 370:O.'G. 757) Thisginvention relatestomeansfor the Movable endmember 8 consists of a main mem-, 1 positionspofthe vparts of --a-split.patternl upon aberat each'end of which the pieces v15 are secured pattern board, and has for its object to providetothe sides thereofl leaving between them a space a .device of -the typegspeciiied that will-make it in-which the-sideerai1s can easily slide. A screw possible' for even amunskilled personto; place 16 passesthrough one ofthe pieces 15 at each end 5 properly the parts of'a splitpattern sothatwhen and is threaded. into lthe other piece 15 whereby, the drag'andthe cope of the fiaskare assembled thepieces 15 can be drawn together and clamped 1' the parts of the moldwill fittogether with a high upon-the side rails. The construction of frame degree of-accuracy. I bracebar 291s similar to that of end member 8 Withthe-above andotherobjects-in'view the except that it does not have init holes for the 10, invention'consists :in the construction; combinaflask/pins The end members have vin them tion and arrangement of partsas-will-be described threaded holesv 17, to receive threaded-pegs 18" l more fullyihereinafter. 'p e r j that may be screwed in to touch flask pins. 7 to In the-drawings: p: 3 I allow the pins to'slide readily but without'play' Fig; l is -a perspective yiew 'of my invention -in order to position the jig accurately with. re-; 15

showing the ijiginwposition ona pattern-board spectto theifiask pins. i toimark dowelrholes or one-half; ofa pattern Movable bars 9, "10 and 11 are double; the two Fig. 12 showsthejig= -in--position;to mark;the-,;partsof each being secured together by .screws dowel holes for the said other half, th ;h015f 19' adjacent their ends that can beltightened to zen-marked in;the firstpositionbeingzshowrr;- c1amp:the barsin position where set, orloosened '20s Fig.3 is a perspective yiew ofathehalvesof-arto permit moving. the bars on side rails 4. pattem inplace upqn the 'pgttern boar d :method of use is ELSfOHOWS: v

Heretofore'the iseof patterns mounted on f ol M ov" ble e nd (member 8lis set with the centers low boards' has; been restrictedi-lbecausee of -the-- of holes 6 therein a distance from the centers of difficulty andcost: of so warranging the pattern holes 6 in -fixed.end member 5 equalto the-dis- 25, on'the board-'that when the-cope ande-thel drag tancebetween the centerslof the'flask pins Ton that; have-beenwmoldede from one pattern,-' arefollow board 20.a'nd the jig is set on the-board assembled; they will vmatchgtogether perfectly. withthe flask pins '7 through holes 6; pegs 18'are This difiicultyis comparable to;maki;hg-the-outv setlightly against the fiaskpins so that thejig lines of the arightvhandgand the; left hand upon maybe readilyliftedoff the pins 7" but longi- 30o theright-handand'left-hand pages of a book so tudinal movement of the jigis prevented. Movthat when-the-book-cis closed the two outlines able bars 9, 10 and-11 arethen shiftedlso that will coincide; p l r holesadaptedeto-thelsize of the pattern dowel Inpreviousmethods of'placing; the parts; the pins are in position. .tohave the dowelswpassed i pattern lines-fixing thenpositions thereof emust= through themrand screws 19. are tightened to hold I 35 be laid downon the-boardso that the 'moldmade the bars in place; in Figs-1 and 2 these holes are therefrom vwill 'match withoutwoverlapping at indicated-by- 151v, The jig, with the pattern on it; any place since" if they do,: not so match the is liftedvfromthe flask pinsand the holes through mold .cannot be.-used.- Thelines so laid down whichthedowelspassaremarkedi The pattern:

40 must be p1aced--very accurately as any-error is then-removedjthe jigreplaced onthe-fiask pins, 40 therein produces twice'that error in the-mold.;- and holes bored into the board through 'them This can be done only by a person highly skilled marked dowel pin holes, the double bars serving and requiresmuch time; j I as aguidelto insurethatthe drill willbe kept per.-

With my invention-the patterns can beplacede pendicularrto the board.' 'If'. the pattern halves withperfect accuracy by: an unskilled-- person and J are to .beldisposed side by side. transversely of the 45 with a saving in time of ,from fifty to ninety board thejig'is then turned upside down about i percent, I p its. longitudinal axis;rif theyare to be arranged The jig compriseswside reils 4 to 'whichis rigidly 1 one. line in the other ldimensionof the board, the. fixed anend:member -5,--ha.ving.in it holes 6 jig-:is turned over. abouta transverseaxis: In"

xthrough which-theflask: pins '7 maybe p sse either case, theflask pins are passed through' the '50s a. lrnovableend member 8,', a frame -brace ban 29f holes in the end members used in the first'position and movable bars 9,w10;- and:- 11-:having' iirthemr and'holes are formed in the bOaTdthrOughItIie' series of holes 12, 13 and 14 or difierentlsizesd w l pinholes inthe movablemembers; to accommodate-pattern;dowel: pins of-different the two groupsof holes thus'formed'having are diame te rs I l V Y lation of-sbilateral symmetry. Thusthe's parts 21 55M and 22 of the pattern are disposed in the relative positions of an object and its mirror image when the dowel pins of the parts are inserted in the holes in the pattern board, as is shown in Fig. 3. By making on the board, as shown in Fig. 3, onehalf the mold in the cope and the other half in the drag, two molds are made in one flask, which match perfectly.

If desired, to fit any particular flask, the movable bars 9, 10 and 11 can be removed from the side rails and slidably mounted on the end members or an end member and frame brace 29, with the movable end member 8 and/or the brace set in a suitable position.

The positions of the flask pins '7 can be fixed to suit any requirement by setting the end member 8 in the proper position, making holes in the board corresponding to suitable holes 6 in the end members and setting the flask pins in those holes.

With this device it is as easy to mount the most intricate pattern as to mount the simplest kind. If the board must be used for another pattern before finishing with one mounted thereon, the pattern can be removed and later quickly replaced without inaccuracy, whereas if the pattern had been mounted by means of lines on the board, they would have been obliterated and the second setting of the pattern would consume as much time as the first. If two boards are used, one for each half of a pattern, it is merely necessary to set the flask pins on the two at equal distances and use the jig the same as when but one board is involved.

Additional advantages accruing from the use of my invention are:

It obviates the necessity of a trial pouring to determine if the parts of the mold are matched;

It eliminates almost entirely the parting line on the casting;

Practically. eliminates the necessity for hand ramming of the mold as an alternative to machine ramming where the principal ground for choice between them is based on the cost of'mounting the parts of the pattern on the board;

Makes possible machine ramming of molds that would ordinarily require six men if done by hand. It is, of course, well known that machine ramming is not only more rapid and cheaper than hand ramming, but the compacting of the sand in the mold is much more uniform and satisfactory when machine ramming is used.

As a concrete example of the saving in time effected by the present invention, split patterns that require two to eight hours to mount by the use of lines on the board can be mounted by means of the jig in fifteen to sixty minutes.

The invention herein described may be manufactured and used by or for the Government of the United States of America for governmental purposes without the payment of any royalties thereon.

I claim:

1. As an article of manufacture, a jig comprising side rails, an end member fixed thereto, a movable end member slidable on said rails and having means to clamp it in position on the rails, both end members having holes to receive flask pins and means to position the flask pins in the holes, a frame brace slidable on the rails and having means to clamp it in place thereon, and a plurality of movable members, each said movable member including bars disposed one on each side of both of said rails and means to clamp the two bars of each member against the rails,

each of said movable members having throughboth bars thereof a plurality of series of registering holes of different sizes to receive the dowel pins of the parts of a split pattern and to serve as guides in making holes in a pattern board in positions corresponding to the positions of said dowel pins.

2. As an article of manufacture, a-jig comprising side rails, an end member fixed thereto, a movable end member slidable on said rails and having means to clamp it in position on the rails, both end members having holes to receive flask pins and means to position the flask pins in the holes, and aplurality of movable members, each movable member including two bars disposed movable end member slidable on said rails and having means to clamp it in position on the rails, both end members having holes to receive flask pins, and a plurality of movable members, each movable member including two bars disposed one on each side of both of said rails and means to clamp the two bars of each member against the rails, each of said movable members having through both bars thereof a plurality of series of registering holes of difierent sizes to receive the dowel pins of the parts of a split pattern and to serve as guides in making holes in a pattern board in positions corresponding to the positions of said dowel pins.

4. As an article of manufacture, a frame including end members and side members, said end members having holes therethrough to receive flask pins, and a plurality of movable members slidable on frame members and adapted to be clamped in position thereon, said movable members having a plurality of series of holes of different sizes to receive the dowel pins of the parts of a split pattern and to serve as guides in making holes in a pattern board in positions corresponding to the positions of the dowel pins.

5. As an article of manufacture, a frame including end members and side members, said end members having holes therethroughto receive flask pins, and a plurality of movable members slidable on frame members and adapted to be clamped in position thereon, said movable members having a plurality of holes of difi'erent sizes therethrough to receive the dowel pins of the parts of a split pattern and to serve as guides in making holes in a pattern board in positions corresponding to the positions of the dowel pins.

6. In a device of the class described, adjustable members having holes to receive the dowel pins of the parts of a split pattern whereby the said members are positioned, means to fix the adjustable members in the respective positions determined by said dowel pins whereby the holes through which the dowel pins pass may serve as guides for making holes in a pattern board in positions corresponding to the positions of said dowelpins, the said holes being adapted to receive the dowel pins in mounting the pattern on the pattern board.

7. In a device of the class described, a frame having a plurality of sides, there being holes in certain of said sides to receive the pins of molding flasks, double members movably mounted on two of said sides and adjustable through a considerable range of angularity with respect to said sides, there being a. plurality of series of holes of different sizes through said double members to receive dowel pins of the parts of a split pattern whereby the positions of said members for any pattern are determined and means to fix said double members relatively to each other and to the sides.

8. A method of determining the position of the parts of a split pattern on a pattern board,

comprising the steps of fixing the positions of a plurality of points to correspond to previously fixed relative positions of the dowel pins of a half of a split pattern, forming a group of holes to receive dowel pins in conformity with the said points, forming another group of holes in conformity with said points but in relative positions having a relation of bilateral symmetry to the aforesaid holes, and mounting the two halves of the pattern with the dowel pins thereof 10 in the said groups of holes.

ALBERT TURNER. I 

